我遵循了一个教程并在我的rails应用程序中添加了消息功能 昨天，我删除了某些用户。现在，当我转到我的消息链接时，我收到此错误消息“我们很抱歉，但出现了问题。如果您是应用程序所有者，请查看日志以获取更多信息。”通常在出现错误时显示。
我看到了日志，发现我必须删除发送邮件的人 我认为它正在尝试检索不存在的用户的消息。
ActionView::Template::Error (undefined method `avatar' for nil:NilClass):
我该如何解决这个问题呢？ 任何人都可以分享如何删除所有邮件并重新开始？因为信息不重要 如何清除所有邮箱表并重新开始？请帮助。
这是日志。
2015-05-16T12:17:13.398640+00:00 app[web.1]: Rendered conversations/_participants.html.erb (17.3ms)
2015-05-16T12:17:13.407905+00:00 app[web.1]: CACHE (0.0ms) SELECT "users".* FROM "users" WHERE "users"."id" = $1 LIMIT 1 [["id", 2225]]
2015-05-16T12:17:13.434486+00:00 app[web.1]: (16.2ms) SELECT COUNT(*) FROM "mailboxer_receipts" INNER JOIN "mailboxer_notifications" ON "mailboxer_notifications"."id" = "mailboxer_receipts"."notification_id" AND "mailboxer_notifications"."type" IN ('Mailboxer::Message') WHERE "mailboxer_notifications"."conversation_id" = 973 AND "mailboxer_receipts"."receiver_id" = $1 AND "mailboxer_receipts"."receiver_type" = $2 AND "mailboxer_receipts"."trashed" = 'f' AND "mailboxer_receipts"."is_read" = 'f' [["receiver_id", 1464], ["receiver_type", "User"]]
2015-05-16T12:17:13.453617+00:00 app[web.1]: Mailboxer::Receipt Load (1.1ms) SELECT "mailboxer_receipts".* FROM "mailboxer_receipts" WHERE "mailboxer_receipts"."notification_id" = $1 [["notification_id", 1209]]
2015-05-16T12:17:13.456255+00:00 app[web.1]: Rendered conversations/_participants.html.erb (20.5ms)
2015-05-16T12:17:13.474657+00:00 heroku[router]: at=info method=GET path="/conversations" host=www.abc.com request_id=991e2d24-c507-4e5f-9b50-5678e2e3aa2c fwd="160.3.94.130" dyno=web.1 connect=1ms service=276ms status=500 bytes=1786
2015-05-16T12:17:13.569003+00:00 heroku[router]: at=info method=GET path="/speak" host=www.abc.com request_id=c1a056f3-4431-4c90-84b8-01c285e606c1 fwd="122.174.14.148" dyno=web.2 connect=1ms service=37ms status=200 bytes=35624
2015-05-16T12:17:13.459247+00:00 app[web.1]: Mailboxer::Message Load (1.8ms) SELECT "mailboxer_notifications".* FROM "mailboxer_notifications" WHERE "mailboxer_notifications"."type" IN ('Mailboxer::Message') AND "mailboxer_notifications"."conversation_id" = $1 ORDER BY created_at DESC LIMIT 1 [["conversation_id", 782]]
2015-05-16T12:17:13.469138+00:00 app[web.1]: Rendered conversations/_conversation.html.erb (233.8ms)
2015-05-16T12:17:13.469485+00:00 app[web.1]: Rendered conversations/index.html.erb within layouts/application (249.4ms)
2015-05-16T12:17:13.469543+00:00 app[web.1]: Completed 500 Internal Server Error in 261ms
2015-05-16T12:17:13.473924+00:00 app[web.1]:
2015-05-16T12:17:13.473928+00:00 app[web.1]: ActionView::Template::Error (undefined method `avatar' for nil:NilClass):
2015-05-16T12:17:13.473930+00:00 app[web.1]: 16:
2015-05-16T12:17:13.473932+00:00 app[web.1]: 17: <span class="messageuser">
2015-05-16T12:17:13.473933+00:00 app[web.1]: 18: <%#= conversation.last_message.sender.name %>
2015-05-16T12:17:13.473936+00:00 app[web.1]: 19: <%= link_to image_tag(conversation.last_message.sender.avatar.url(:mini), class: 'img-rounded'), user_path(conversation.last_message.sender) %>
2015-05-16T12:17:13.473944+00:00 app[web.1]: 20: <%= link_to conversation.last_message.sender.name, user_path(conversation.last_message.sender) %>
2015-05-16T12:17:13.473946+00:00 app[web.1]: 21: </span>
2015-05-16T12:17:13.473948+00:00 app[web.1]: 22:
2015-05-16T12:17:13.473951+00:00 app[web.1]: app/views/conversations/_conversation.html.erb:19:in `_app_views_conversations__conversation_html_erb___2085506579815819501_69959535266760'
2015-05-16T12:17:13.473952+00:00 app[web.1]: app/views/conversations/index.html.erb:35:in `_app_views_conversations_index_html_erb___1748297580391940998_69959535151580'
2015-05-16T12:17:13.473954+00:00 app[web.1]:
2015-05-16T12:17:13.473957+00:00 app[web.1]:
2015-05-16T12:17:13.572052+00:00 app[web.1]: Started GET "/conversations" for 160.3.94.130 at 2015-05-16 12:17:13 +0000
2015-05-16T12:17:13.579974+00:00 app[web.1]: User Load (1.3ms) SELECT "users".* FROM "users" WHERE "users"."id" = $1 LIMIT 1 [["id", 1464]]
2015-05-16T12:17:13.585203+00:00 app[web.1]: (0.9ms) SELECT COUNT(*) FROM "user_learnings" WHERE "user_learnings"."user_id" = $1 [["user_id", 1464]]
2015-05-16T12:17:13.637517+00:00 app[web.1]: (3.1ms) SELECT DISTINCT COUNT(DISTINCT "mailboxer_conversations"."id") FROM "mailboxer_conversations" INNER JOIN "mailboxer_notifications" ON "mailboxer_notifications"."conversation_id" = "mailboxer_conversations"."id" AND "mailboxer_notifications"."type" IN ('Mailboxer::Message') INNER JOIN "mailboxer_receipts" ON "mailboxer_receipts"."notification_id" = "mailboxer_notifications"."id" WHERE "mailboxer_notifications"."type" = 'Mailboxer::Message' AND "mailboxer_receipts"."receiver_id" = $1 AND "mailboxer_receipts"."receiver_type" = $2 AND "mailboxer_receipts"."mailbox_type" = $3 AND "mailboxer_receipts"."trashed" = 'f' AND "mailboxer_receipts"."deleted" = 'f' [["receiver_id", 1464], ["receiver_type", "User"], ["mailbox_type", "inbox"]]
2015-05-16T12:17:13.678884+00:00 app[web.1]: Mailboxer::Receipt Load (1.2ms) SELECT "mailboxer_receipts".* FROM "mailboxer_receipts" WHERE "mailboxer_receipts"."notification_id" = $1 [["notification_id", 1443]]
2015-05-16T12:17:13.698778+00:00 app[web.1]: User Load (4.5ms) SELECT "users".* FROM "users" WHERE "users"."id" = $1 LIMIT 1 [["id", 1464]]
2015-05-16T12:17:13.464477+00:00 app[web.1]: User Load (1.2ms) SELECT "users".* FROM "users" WHERE "users"."id" = $1 LIMIT 1 [["id", 1937]]
答案 0 :(得分：2)
我变得不耐烦并将它们全部摧毁了。
irb(main):002:0> Mailboxer::Conversation.destroy_all
现在错误已经消失，我可以发送消息 我不知道如何删除我最近删除的800个用户的对话。
答案 1 :(得分：1)
你是对的。应用程序正在调用不存在的用户的方法。例如： ```
<%= link_to conversation.last_message.sender.name...
（conversation.last_message）已保存，但发件人不存在。
如果要从头开始启动数据库，可以运行（rake db：reset），这将删除创建和迁移数据库。
要解决此问题，请创建一种方法，该方法在用户每次取消或删除其帐户时运行，并删除该用户的对话。 试试这是你的控制台（rails c），它将删除第一个用户的对话。 ```
User.first.mailbox.conversations.each do |i| i.delete end
如果您仍想向未取消其帐户的其他用户显示对话。您必须将该名称保存在其他位置，或向用户显示发件人已删除其帐户。 ```
<% if conversation.sender == null %>
<%= conversation.last_message %>
<p>User of this conversation deleted his/her account</p>
<%else%>
<%= conversation.last_message %>
<%= conversation.last_message.sender.name %>
<% end %>
答案 2 :(得分：0)
听起来像是一种未经优化的方式，可以通过acts_as_messageable向MyModel.each do |mod| mod.mailbox.conversations.destroy_all end添加消息功能的模型进行循环播放..例如chmod a-x